Sounds like you want it to happen too quickly. It won't get good on your first quilt. I continue to improve after doing a few hundred charity ones before I tackled some of mine. Even now, when my quilting is pretty good, I still get out the practice sandwich and play with the stitching until I get 'freed up' and into the rhythm. Just try a simple meandering or swirly stitch first - ones that don't have to be balanced. They look the best, as you can't "spot the mistake".